Attachment for drill-chucks.



J. B. ERIGKSON.

ATTACHMENT FOB DRILL GHUGKS.

APPLICATION FILED MAY 1, 1914.

1,131,918. Patented Mar. 16, 1915.

'CIE. Erickson,

UNITED STATES PATENT OFFICE.

JOHN E. EBICKSON, F TONOPAH, NEVADA, ASSIGNOB OF TWO-THIRDS TO J. E. MQNAMARA AND J. H. FRISBY, BOTH 0F TONOPAH, NEVADA.

Specification 0! Letters Patent.

Patented Mar. 16, 1915.

Application filed May 1, 1914. Serial No. 835,748.

To all whom it may concern Be it known that I, JOHN E. Er c son, a citizen of the United States, residing at Tonopah, in the county of Nye and State of Nevada, have invented a new and useful Improvement in Attachments for Dllll-QllllCkS, of which the following is a specification.

This invention relates to an attachment for drill chucks adapted to hold the drill and prevent it from remaining in the hole drilled when the power is cut-off.

The device is especially adapted for use with rock or mine drills and can be applied to practically any of the machines now in use. v

The objectof the invention is to save time, for example, a man can at present drill a four foot hole with any of the drills above mentioned in from fifteen to thirty minutes and it may take as much additional time to get the drill out, for the reason that when the power is shut off the machine leaves the bit or drill rod in the hole. Consequently much time is lost in pulling the drill out of the hole either when the boring operation is gnilslhed or it becomes necessary to change a The invention consists of the novel features of construction hereinafter described, pointed out in the claims and shown in the accompanying drawings, in which:

Figure 1 is a perspective view showing the parts in normal position. Fig. 2 is a perspective view'showing the clutch gripping the drill. Fig. 3 is a detail perspective view showing the parts connected to the chuck. F ig, 4 is a perspective view of the clutch detached.

In these drawings 1 represents a chuck and 2 a drill, these parts being in common use, and it will be noted that the drill is provided with longitudinal grooves usually four in number.

My invention consists of a split band 3 adapted to be tightly secured around thechuck 1. One side of this band carries a strap 4 which extends along one side of the chuck and has its outer end portion cut and rolled over to form hinge members .5. Upon the inner side of the strap 4 is secured a leaf spring 6. To the opposite side of the band 3 is secured a fiat spring plate 7 provided upon'ifiouter face and adjacent its 11 adapted when bent over upon itself to form a third member of a hinge and to rest between the hinge members 5 of the strap 4, a suitable pintle pin 11 passing through said members and hinging the plate 9 to the strip, the free end of the spring 6 bearing against the under side of the plate 9 and tending to throw it into locking position. Upon the opposite side of the plate 4 of the lug 11 is a perforated tongue 12 adapted to be engaged by the knob 8 of the spring plate 7 thereby holding the plate 9 in normal position as shown in Fig. 2.

When the drill is to be pulled out the finger is pressed against the spring plate 7 thereby releasing the knob 8 from engagement with the tongue 12 and the spring 6 throws the plate 9 into an oblique position, as shown in Fig. 2, thereby causing the teeth 10 to grip the drill and the drill is withdrawn readily from the hole bored.

What I claim is 1. The combination with a drill chuck and drill, of a clutch adapted to normally rest flat across the end of the clutch and permit free rotation of the drill, means secured to the chuck, hinged connecting means between said clutch and the said means connected to the chuck, means for locking the chuck in normal position and means for automatically throwing it into an oblique position with reference to the drill upon release of said locking means.

2. The combination with a chuck and drill, of a ring secured to said chuck, a strap carried by said ring, a clutch plate hinged to said strap, means for throwing said clutch plate into an oblique position, said plate gripping the drill when in' such position, and means for locking said clutch plate in a plane at right angles to the drill.

g). The combination with a chuck and drill, a ring secured to said chuck, a strap connected to the ring, a clutch plate oenplate carried by the ring adapted to engage trally cut-out to permit free passage of the said tongue and t0 normally old the clutch drill, and having biting teeth promoting inplate in an operative osition.

wardly, a s ring secured to said strap JO N E. ERICKSON. adapted to w said plate into grippi Witnesses:

- position relative to the drill, a erforate J. E. MCNAMARA,

tongue carried by the plate, an a spring J. H. Fmsnr.

' MIN of this patent my be obtained for five cents each, by addressing the "Commissioner of Patents,

, t Washington, D. 0. 

